+
+bool
+valid_image_file (boost::filesystem::path f)
+{
+ string ext = f.extension().string();
+ transform (ext.begin(), ext.end(), ext.begin(), ::tolower);
+ return (ext == ".tif" || ext == ".tiff" || ext == ".jpg" || ext == ".jpeg" || ext == ".png" || ext == ".bmp" || ext == ".tga");
+}
+
+string
+tidy_for_filename (string f)
+{
+ string t;
+ for (size_t i = 0; i < f.length(); ++i) {
+ if (isalnum (f[i]) || f[i] == '_' || f[i] == '-') {
+ t += f[i];
+ } else {
+ t += '_';
+ }
+ }
+
+ return t;
+}
+
+shared_ptr<const libdcp::Signer>
+make_signer ()
+{
+ boost::filesystem::path const sd = Config::instance()->signer_chain_directory ();
+
+ /* Remake the chain if any of it is missing */
+
+ list<boost::filesystem::path> files;
+ files.push_back ("ca.self-signed.pem");
+ files.push_back ("intermediate.signed.pem");
+ files.push_back ("leaf.signed.pem");
+ files.push_back ("leaf.key");
+
+ list<boost::filesystem::path>::const_iterator i = files.begin();
+ while (i != files.end()) {
+ boost::filesystem::path p (sd);
+ p /= *i;
+ if (!boost::filesystem::exists (p)) {
+ boost::filesystem::remove_all (sd);
+ boost::filesystem::create_directories (sd);
+ libdcp::make_signer_chain (sd, openssl_path ());
+ break;
+ }
+
+ ++i;
+ }
+
+ libdcp::CertificateChain chain;
+
+ {
+ boost::filesystem::path p (sd);
+ p /= "ca.self-signed.pem";
+ chain.add (shared_ptr<libdcp::Certificate> (new libdcp::Certificate (p)));
+ }
+
+ {
+ boost::filesystem::path p (sd);
+ p /= "intermediate.signed.pem";
+ chain.add (shared_ptr<libdcp::Certificate> (new libdcp::Certificate (p)));
+ }
+
+ {
+ boost::filesystem::path p (sd);
+ p /= "leaf.signed.pem";
+ chain.add (shared_ptr<libdcp::Certificate> (new libdcp::Certificate (p)));
+ }
+
+ boost::filesystem::path signer_key (sd);
+ signer_key /= "leaf.key";
+
+ return shared_ptr<const libdcp::Signer> (new libdcp::Signer (chain, signer_key));
+}
+
+libdcp::Size
+fit_ratio_within (float ratio, libdcp::Size full_frame)
+{
+ if (ratio < full_frame.ratio ()) {
+ return libdcp::Size (full_frame.height * ratio, full_frame.height);
+ }
+
+ return libdcp::Size (full_frame.width, full_frame.width / ratio);
+}